<?php
/**
 * Created by PhpStorm.
 * User: GZ-1
 * Date: 2017/6/3
 * Time: 11:38
 */

include_once "connectMySql.php";

// 生成36位的唯一标识符
function uuid($prefix = ""){    //可以指定前缀
    $str = md5(uniqid(mt_rand(), true));
    $uuid  = substr($str,0,8) . '-';
    $uuid .= substr($str,8,4) . '-';
    $uuid .= substr($str,12,4) . '-';
    $uuid .= substr($str,16,4) . '-';
    $uuid .= substr($str,20,12);
    return $prefix . $uuid;
}

// 将对象转成数组
function objectToArray($targetObj){
    $arr=array();
    foreach ($targetObj as $key=>$value){
        $arr[$key]=$value;
    }
    return $arr;
}

// 将图片转成base64数据
function base64EncodeImage ($image_file) {
    $base64_image = '';
    $image_info = getimagesize($image_file);
    $image_data = fread(fopen($image_file, 'r'), filesize($image_file));
    $base64_image = 'data:' . $image_info['mime'] . ';base64,' . chunk_split(base64_encode($image_data));
    return str_replace(" ","",$base64_image);
}

function _delete_bom($str){
    if (ord($str{0}) == 0xef && ord($str{1}) == 0xbb && ord($str{2}) == 0xbf) {
        $str = substr($str, 3);
    }
    return $str;
}

function clearbom($contents){
    //UTF8 去掉文本中的 bom头
    $BOM = chr(239).chr(187).chr(191);
    return str_replace($BOM,'',$contents);
}

class ResizeImage{
    public $type;//图片类型
    public $width;//实际宽度
    public $height;//实际高度
    public $resize_width;//改变后的宽度
    public $resize_height;//改变后的高度
    public $cut;//是否裁图
    public $srcimg;//源图象
    public $dstimg;//目标图象地址
    public $im;//临时创建的图象
    public $quality;//图片质量
    public $img_array=array('jpg','png','gif');
    //http://www.phpernote.com/php-function/782.html
    function __construct($img,$wid,$hei,$c,$dstpath,$quality=100){
        $this->srcimg=$img;
        $this->resize_width=$wid;
        $this->resize_height=$hei;
        $this->cut=$c;
        $this->quality=$quality;
        //$this->type=strtolower(substr(strrchr($this->srcimg,'.'),1));//图片的类型
        $this->type=$this->checkFileType($this->srcimg);//更为严格的检测图片类型
        if(!in_array($this->type,$this->img_array)){
            return '';
        }
        $this->initi_img();//初始化图象
        $this -> dst_img($dstpath);//目标图象地址
        $this->width=imagesx($this->im);
        $this->height=imagesy($this->im);
        $this->newimg();//生成图象
        ImageDestroy($this->im);
    }
    function newimg(){
        $resize_ratio=($this->resize_width)/($this->resize_height);//改变后的图象的比例
        $ratio=($this->width)/($this->height);//实际图象的比例
        if(($this->cut)=='1'){//裁图
            if(function_exists('imagepng')&&(str_replace('.','',PHP_VERSION)>=512)){//针对php版本大于5.12参数变化后的处理情况
                $quality=9;
            }
            if($ratio>=$resize_ratio){//高度优先
                $newimg=imagecreatetruecolor($this->resize_width,$this->resize_height);
                //上色
                $color=imagecolorallocate($newimg,255,255,255);
                //设置透明
                imagecolortransparent($newimg,$color);
                imagefill($newimg,0,0,$color);
                imagecopyresampled($newimg,$this->im,0,0,0,0,$this->resize_width,$this->resize_height,(($this->height)*$resize_ratio),$this->height);
                imagejpeg($newimg,$this->dstimg,$this->quality);
            }
            if($ratio<$resize_ratio){//宽度优先
                $newimg=imagecreatetruecolor($this->resize_width,$this->resize_height);
                //上色
                $color=imagecolorallocate($newimg,255,255,255);
                //设置透明
                imagecolortransparent($newimg,$color);
                imagefill($newimg,0,0,$color);
                imagecopyresampled($newimg,$this->im,0,0,0,0,$this->resize_width,$this->resize_height,$this->width,(($this->width)/$resize_ratio));
                imagejpeg($newimg,$this->dstimg,$this->quality);
            }
        }else{//不裁图
            if($ratio>=$resize_ratio){
                $newimg=imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
                //上色
                $color=imagecolorallocate($newimg,255,255,255);
                //设置透明
                imagecolortransparent($newimg,$color);
                imagefill($newimg,0,0,$color);
                imagecopyresampled($newimg,$this->im,0,0,0,0,$this->resize_width,($this->resize_width)/$ratio,$this->width,$this->height);
                imagejpeg($newimg,$this->dstimg,$this->quality);
            }
            if($ratio<$resize_ratio){
                $newimg=imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
                //上色
                $color=imagecolorallocate($newimg,255,255,255);
                //设置透明
                imagecolortransparent($newimg,$color);
                imagefill($newimg,0,0,$color);
                imagecopyresampled($newimg,$this->im,0,0,0,0,($this->resize_height)*$ratio,$this->resize_height,$this->width,$this->height);
                imagejpeg($newimg,$this->dstimg,$this->quality);
            }
        }
    }
    function initi_img(){//初始化图象
        if($this->type=='jpg'){
            $this->im=imagecreatefromjpeg($this->srcimg);
        }
        if($this->type=='gif'){
            $this->im=imagecreatefromgif($this->srcimg);
        }
        if($this->type=='png'){
            $this->im=imagecreatefrompng($this->srcimg);
        }
    }
    function dst_img($dstpath){//图象目标地址
        $full_length=strlen($this->srcimg);
        $type_length=strlen($this->type);
        $name_length=$full_length-$type_length;
        $name=substr($this->srcimg,0,$name_length-1);
        $this->dstimg=$dstpath;
        //echo $this->dstimg;
    }
    //读取文件前几个字节 判断文件类型
    function checkFileType($filename){
        $file=fopen($filename,'rb');
        $bin=fread($file,2); //只读2字节
        fclose($file);
        $strInfo =@unpack("c2chars",$bin);
        $typeCode=intval($strInfo['chars1'].$strInfo['chars2']);
        $fileType='';
        switch($typeCode){
            case 7790:
                $fileType='exe';
                break;
            case 7784:
                $fileType='midi';
                break;
            case 8297:
                $fileType='rar';
                break;
            case 255216:
                $fileType='jpg';
                break;
            case 7173:
                $fileType='gif';
                break;
            case 6677:
                $fileType='bmp';
                break;
            case 13780:
                $fileType='png';
                break;
            default:
                $fileType='unknown'.$typeCode;
                break;
        }
        if($strInfo['chars1']=='-1'&&$strInfo['chars2']=='-40'){
            return 'jpg';
        }
        if($strInfo['chars1']=='-119'&&$strInfo['chars2']=='80'){
            return 'png';
        }
        return $fileType;
    }
}